| Zhu Huayong,Pan Jingli,Zhu Weiping,Li Yangfei,Ding Jianrong,Fan Shufeng,Ji Wenbin.Effect of adaptive statistical iterative reconstruction algorithm on the imaging quality in low-dose spectral CT scanning of the liver[J].Chinese Journal of Radiological Medicine and Protection,2015,35(12):948-952 |
| Effect of adaptive statistical iterative reconstruction algorithm on the imaging quality in low-dose spectral CT scanning of the liver |
| Received:May 27, 2015 |
| DOI：10.3760/cma.j.issn.0254-5098.2015.12.015 |
| KeyWords:Liver Spectral imaging Adaptive statistical iterative reconstruction (ASIR) Radiation dose Tomography, X-ray computed |
| FundProject:浙江省医药卫生科技计划A类项目(2013KYA227) |
| Author Name | Affiliation | E-mail | | Zhu Huayong | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | | | Pan Jingli | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | | | Zhu Weiping | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | | | Li Yangfei | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | | | Ding Jianrong | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | | | Fan Shufeng | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | | | Ji Wenbin | Radiology Department, Taizhou Hospital of Zhejiang Province, Linhai 317000, China | jwb_tzyy@126.com |
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| Abstract:: |
| Objective To investigate the value of the adaptive statistical iterative reconstruction (ASIR) algorithm for reducing the radiation dose and optimizing the image quality in the low-dose spectral CT scanning in GSI (Gemstone spectral imaging) of the liver. Methods A total of 60 patients who underwent hepatic spectral CT scanning in GSI were enrolled in this study. The patients were randomly divided into two groups according to priority with 30 cases per group. Low-dose spectral CT scanning was used for group A, and images were reconstructed by ASIR 0 and 50%, marked as A1 and A2. Group B was scanned with conventional dose of spectral CT, and images were reconstructed by Filtered back projection (FBP). Effective doses (E) for each group were calculated. Image quality was assessed by two radiologists, and the radiation doses were compared between groups A and B. Results All image quality of each group were good enough for clinical diagnosis. E for group A and B were (3.2±0.2) and (5.8±0.2) mSv, respectively. There was statistical difference with image noise between group A and B(Z=-6.784,P<0.05). The image noise, SNR and CNR had statistical differences between group A and B (F=24.013, 15.646, 8.285, P<0.05). Compared with group A1, the image noise was lower, and the SNR and CNR were higher in groups A2 and B(P<0.05). There were no statistical differences of image noise, SNR and CNR between groups A2 and B (P>0.05). There were no statistical differences of the image quality score between groups A1, A2 and B (F=102.38,105.768,P0.05). Conclusions ASIR combined with low-dose spectral CT scanning was helpful to reduce radiation dose and could obtain better image quality in hepatic CT examination. |
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